Mr Scott’s observations confirmed that hydrothermal activity in the small 'hot lake' has increased. The most common activity is "doming-up" of the lake surface by steam/gas, bringing large amounts of sediment to the surface, often with vivid white steam/gas 'flashing' from around the base. Every so often stronger events happened. This activity has been increasing since late 2012 and is now semi-continuous.

GNS volcanologist Brad Scott said “the hydrothermal activity is some of the most vigorous I have seen at White Island for many years. This type of activity usually leads to stronger volcanic activity and is a significant concern.”